Double helix antenna



FIG. 1 is a perspective view of a double helix antenna.

FIG. 2 is a top view of the double helix antenna of which the bottom view is a mirror image; and,

FIG. 3 is a front view of the double helix antenna of which the rear view, left side view and right side view are mirror images thereof. 

CLAIM The ornamental design for a double helix antenna, as shown and described. 